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A049570 as a simple table

na(n)
12
27
317
423
531
641
747
871
973
1079
1189
1297
13103
14113
15127
16137
17151
18167
19193
20199
21223
22233
23239
24241
25257
26263
27271
28281
29311
30313
31337
32353
33359
34367
35383
36401
37409
38431
39433
40439
41449
42463
43479
44487
45503
46521
47569
48577
49593
50599
51601
52607
53617
54631
55641

[2,7,17,23,31,41,47,71,73,79,89,97,103,113,127,
 137,151,167,193,199,223,233,239,241,257,263,271,
 281,311,313,337,353,359,367,383,401,409,431,433,
 439,449,463,479,487,503,521,569,577,593,599,601,
 607,617,631,641]